httpstatus.io - im using this site to check some of my SCA site’s URLs and some of my SMT page urls are coming up 404 / some 200. the pages that return 404 also are working just fine on a browser when navigated to so im not sure why this site would say its 404. and also blogs seem to also get 404 .. any one else experience bad 404 HTTP codes ?

Sometimes 404s can be returned if the SEO page generator cannot generate the page. Use the seodebug parameter to force the SEO page to generate and then check the source for any errors. Common cause is JavaScript that is newer than 5.1

@Steve Goldberg yes it was due to newer JS with let / const and arrow functions - thanks very much!